Tread or belt separation appears in 24% of these reports; about 1.8× as often as across all tire complaints. Percentages are shares of the 759 reports filed against Cooper tires across every line and vehicle that include a written account; a single report can describe more than one problem, so they do not total 100%.

Reported problem	This subject	All tire complaints	Relative
Tread or belt separation	24%	13%	1.8×
Blowout or sudden deflation	21%	20%	1.0×
Sidewall failure	21%	15%	1.4×
Bubble or bulge in the tire	12%	6%	2.0×
Loss of control, rollover or collision	9%	8%	1.0×
Cracking or dry rot	7%	9%	0.7×

Mileage at failure

446 of these reports state an odometer reading. The middle report is at 42,999 miles, with 8 in 10 falling between 5,219 and 155,000 miles.

In owners' own words

Verbatim excerpts from complaints filed with NHTSA about Cooper. Reports are published by NHTSA as filed and are lightly cleaned here only to remove intake codes.

THIS IS THE SECOND SAME SIZE COOPER TIRE THAT HAS FAILED THE SAME WAY IN THE SAME TIME FRAME. THE TIRE WAS PROPERLY INFLATED AND BEGAN TO LOSE AIR EVEN THOUGH IT HAD NO PUNCTURES IN THE TIRE. THE TIRE STARTED TO RUN LOW AND THE SIDEWALL CRACKED AND DID NOT DEFLATE BUT RAN WITH LOW PRESSURE. I NOTICED THAT THE TIRE WAS LOW BUT NOT DEFLATED. UPON EXAMINATION OF THE TIRE THE SAME CRACKS APPEARS ON THE SIDE WALL AND NOTHING WAS HIT THAT HAD ABRADED THE TIRE. BOTH TIRES WERE SIZE 215/50 R17 CS4 V XL BW 95 TL. BOTH TIRES LASTED APPROX 15-17K MILES BEFORE FAILING AND APPROX 2 YEARS IN EACH CASE. ONE WAS REPLACED BY THE TIRE DEALER ONLY BECAUSE I HAD BOUGHT THE TIRE PROTECTION POLICY AND THE OTHER WAS NO LONGER COVERED AS REPLACEMENTS ARE NO LONGER COVERED AFTER 12K OR 1 YR. BOTH TIRES COULD NOT BE REPAIRED AS THE SIDEWALL HAS FAILED.

NHTSA complaint 1024001

3 OF 4 TIRES, COOPER DISCOVERER LSX P265 / 70R17, FAILED WITHIN 8 MONTHS OF EACH OTHER DUE TO STEEL BELTS SEPARATING AT APPROXIMATELY 19 - 20,000 MILES. IN THE LAST INSTANCE I EXPERIENCED A BLOWOUT WHILE DRIVING. ALL 4 TIRES WERE PURCHASED NEW AND IN GOOD CONDITION WHEN THE INCIDENTS OCCURRED. THEY ALL HAVE THE SAME D.O.T #: UP1YCL71010.

NHTSA complaint 1116201

THE CONTACT OWNS A 2009 MERCEDES BENZ C300 EQUIPPED WITH COOPER TIRES, TIRE LINE: VELOZZA ZXV, AND TIRE SIZE: 255/35/R18 (N/A). THE CONTACT STATED THAT WHILE DRIVING AT APPROXIMATELY 70 MPH, THE TIRE PRESSURE WARNING LIGHT ILLUMINATED. THE CONTACT DISCOVERED THAT THE REAR DRIVER SIDE TIRE WAS FLAT AND THE TREAD SEPARATED FROM THE TIRE. THE VEHICLE WAS TAKEN TO A DEALER WHERE IT WAS CONFIRMED THAT THE TIRE READ SEPARATED AND NEEDED TO BE REPLACED. THE TIRES WAS NOT REPLACED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE APPROXIMATE VEHICLE FAILURE MILEAGE WAS 57,965 AND THE TIRE FAILURE MILEAGE WAS 3,500.

NHTSA complaint 1152205

I WAS DRIVING ON I-95 WHEN MY VEHICLE STARTED THUMPING AND VIBRATING ERRATICALLY AND STEERING WAS VERY HARD TO CONTROL. I EXITED IMMEDIATELY TO FIND THAT MY TIRE HAD A HUGE BULGE A LITTLE LARGER THAN A SOFTBALL. A MAN STOPPED AND SAID I SHOULD BE OKAY TO DRIVE THE 2 MILES I HAD LEFT TO GET HOME. WHEN I BACKED OUT TO DRIVE HOME THE BULGE POPPED EXPOSING BROKEN PLY CORDS AND TREAD SEPARATION.

NHTSA complaint 1213971

Complaints are voluntarily submitted to the NHTSA Office of Defects Investigation and are not verified by NHTSA; they represent owner-reported problems, not proven defects. Counts can be useful as a relative quality signal across comparable tires or vehicles.

Specs

Brand	Cooper
Model	Discoverer STT PRO
Season	N/A
Type	N/A
UTQG treadwear	N/A
UTQG traction	N/A
UTQG temperature	N/A
Mileage warranty	N/A
Noise (dB)	N/A
Introduced	N/A

Live prices

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Available sizes (27)

Cooper discoverer STT PRO: what the numbers tell you

Manufacturer treadwear data for the Discoverer STT PRO is not publicly listed. This is common for OEM-only or track-day tires that don't carry a US treadwear warranty. No mileage warranty is published for this tire, which is typical for performance summer and track-day rubber where the manufacturer doesn't make wear-life claims.

Cabin noise data for this tire is not published by the manufacturer. As a general tire built for the passenger segment, the Discoverer STT PRO is positioned against direct rivals within the same category. Comparing it to a tire in a different category (e.g. summer vs all-season) makes the spec sheet misleading because the design targets are not the same.

Introducing the Cooper Discoverer STT Pro, an exceptional tire designed to conquer the toughest off-road terrains with unmatched performance and durability. Whether you're tackling muddy trails, rocky paths, or sandy dunes, this tire is built to provide you with the ultimate off-road experience. The Cooper Discoverer STT Pro is engineered with advanced technologies and innovative features to ensure maximum traction and control in challenging conditions. Its aggressive tread pattern combines large, uniquely designed lugs and sidewall features, delivering superior grip and self-cleaning capabilities. This means you can confidently navigate through deep mud, loose gravel, and slippery surfaces without compromising performance. With its 3-ply Armor-Tek3 construction, the Discoverer STT Pro offers outstanding puncture resistance and enhanced durability. The silica-infused tread compound provides excellent wet traction, ensuring optimal performance even on wet roads or in light snow. This tire's strong sidewall design also protects against cuts and abrasions, giving you peace of mind during your off-road adventures. Thanks to its optimized tread block arrangement, the Cooper Discoverer STT Pro offers reduced road noise and enhanced stability for comfortable on-road driving. This tire is designed to provide a smooth and quiet ride, making it a versatile choice for both off-road enthusiasts and daily commuters. In addition to its remarkable performance, the Cooper Discoverer STT Pro has a rugged and aggressive appearance that enhances the overall aesthetics of your vehicle. Its bold sidewall design features high-void, staggered shoulder lugs and sidewall traction bars, adding visual appeal and enhancing off-road traction. Choose the Cooper Discoverer STT Pro to elevate your off-road capabilities to new heights. Whether you're an avid off-roader seeking thrilling adventures or a rugged driver who needs a reliable tire that can handle any terrain, this tire is the perfect choice. Dominate the off-road with confidence and experience the unparalleled performance of the Cooper Discoverer STT Pro.

For an apples-to-apples comparison against direct rivals, see the comparison pages linked from this tire's brand index.

OEM fitment

Vehicles that ship with this tire

1981

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Retailer pricing & reviews

NHTSA-reported issues for cooper discoverer STT PRO

What owners described

Mileage at failure

In owners' own words

Specs

Live prices

Available sizes (27)

Cooper discoverer STT PRO: what the numbers tell you

Vehicles that ship with this tire

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

Ford F-250

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